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Registro Completo |
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Biblioteca(s): |
Embrapa Amazônia Oriental. |
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Data corrente: |
04/11/2016 |
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Data da última atualização: |
20/05/2022 |
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Autoria: |
ZAHN, E.; DIAS, N. L.; ARAUJO, A.; SÁ, L.; SÖRGEL, M.; TREBS, I.; WOLFF, S.; MANZI, A. |
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Afiliação: |
EINARA ZAHN, UFPR; NELSON L. DIAS, UFPR; ALESSANDRO CARIOCA DE ARAUJO, CPATU; LEONARDO SÁ, INPE; MATTHIAS SÖERGE, Max Planck Institute for Chemistry; IVONNE TREBS, ERIN; STEFAN WOLFF, Max Planck Institute for Chemistry; ANTÔNIO MANZI, INPA. |
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Título: |
Scalar turbulent behavior in the roughness sublayer of an Amazonian forest. |
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Ano de publicação: |
2016 |
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Fonte/Imprenta: |
Atmospheric Chemistry and Physics Discussions, 18 Jan. 2016. |
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DOI: |
10.5194/acp-2015-1043 |
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Idioma: |
Português |
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Conteúdo: |
An important current problem in micrometeorology is the characterization of turbulence in the roughness sublayer (RSL), where most of the measurements above tall forests are made. There, scalar turbulent fluctuations display significant departures from the predictions of Monin?Obukhov similarity theory (MOST). In this work, we analyze turbulence data of virtual temperature, carbon dioxide, and water vapor in the RSL above an Amazonian forest (with a canopy height of 40?m), measured at 39.4 and 81.6?m above the ground under unstable conditions. We found that dimensionless statistics related to the rate of dissipation of turbulence kinetic energy (TKE) and the scalar variance display significant departures from MOST as expected, whereas the vertical velocity variance follows MOST much more closely. Much better agreement between the dimensionless statistics with the Obukhov similarity variable, however, was found for the subset of measurements made at a low zenith angle Z, in the range 0°??MenosAn important current problem in micrometeorology is the characterization of turbulence in the roughness sublayer (RSL), where most of the measurements above tall forests are made. There, scalar turbulent fluctuations display significant departures from the predictions of Monin?Obukhov similarity theory (MOST). In this work, we analyze turbulence data of virtual temperature, carbon dioxide, and water vapor in the RSL above an Amazonian forest (with a canopy height of 40?m), measured at 39.4 and 81.6?m above the ground under unstable conditions. We found that dimensionless statistics related to the rate of dissipation of turbulence kinetic energy (TKE) and the scalar variance display significant departures from MOST as expected, whereas the vertical velocity variance follows MOST much more closely. Much better agreement between the dimensionless statistics with the Obukhov similarity variable, however, was found for the subset of measurements made at a low zenith angle Z, in the range 0°??Mostrar Tudo |
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Thesagro: |
Climatologia; Floresta Tropical. |
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Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/149608/1/acp-2015-1043.pdf
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Marc: |
LEADER 02283naa a2200241 a 4500
001 2055916
005 2022-05-20
008 2016 bl uuuu u00u1 u #d
024 7 $a10.5194/acp-2015-1043$2DOI
100 1 $aZAHN, E.
245 $aScalar turbulent behavior in the roughness sublayer of an Amazonian forest.$h[electronic resource]
260 $c2016
520 $aAn important current problem in micrometeorology is the characterization of turbulence in the roughness sublayer (RSL), where most of the measurements above tall forests are made. There, scalar turbulent fluctuations display significant departures from the predictions of Monin?Obukhov similarity theory (MOST). In this work, we analyze turbulence data of virtual temperature, carbon dioxide, and water vapor in the RSL above an Amazonian forest (with a canopy height of 40?m), measured at 39.4 and 81.6?m above the ground under unstable conditions. We found that dimensionless statistics related to the rate of dissipation of turbulence kinetic energy (TKE) and the scalar variance display significant departures from MOST as expected, whereas the vertical velocity variance follows MOST much more closely. Much better agreement between the dimensionless statistics with the Obukhov similarity variable, however, was found for the subset of measurements made at a low zenith angle Z, in the range 0°??<??|Z|??<??20°. We conjecture that this improvement is due to the relationship between sunlight incidence and the ?activation?deactivation? of scalar sinks and sources vertically distributed in the forest. Finally, we evaluated the relaxation coefficient of relaxed eddy accumulation: it is also affected by zenith angle, with considerable improvement in the range 0°??<??|Z|??<??20°, and its values fall within the range reported in the literature for the unstable surface layer. In general, our results indicate the possibility of better stability-derived flux estimates for low zenith angle ranges.
650 $aClimatologia
650 $aFloresta Tropical
700 1 $aDIAS, N. L.
700 1 $aARAUJO, A.
700 1 $aSÁ, L.
700 1 $aSÖRGEL, M.
700 1 $aTREBS, I.
700 1 $aWOLFF, S.
700 1 $aMANZI, A.
773 $tAtmospheric Chemistry and Physics Discussions, 18 Jan. 2016.
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Registro original: |
Embrapa Amazônia Oriental (CPATU) |
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 | Acesso ao texto completo restrito à biblioteca da Embrapa Arroz e Feijão. Para informações adicionais entre em contato com cnpaf.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Arroz e Feijão; Embrapa Cerrados. |
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Data corrente: |
12/02/2008 |
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Data da última atualização: |
22/02/2008 |
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Tipo da produção científica: |
Artigo em Anais de Congresso / Nota Técnica |
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Circulação/Nível: |
-- - -- |
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Autoria: |
BARBOSA, V.; KLUTHCOUSKI, J.; MUNIZ, L. C.; MAGNABOSCO, C. de U.; TROVO, J. B. de F.; OLIVEIRA, P. de. |
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Afiliação: |
Vanessa Barbosa, Associação Nacional de Criadores e Pesquisadores; João Kluthcouski, CNPAF; Luciano Cavalcanti Muniz, doutorando Universidade Federal de Goiás; Claudio de Ulhôa Magnabosco, CPAC; José Benedito de Freitas Trovo, Cenargen; Priscila de Oliveira, pós-graduanda Universidade Federal de Goiás. |
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Título: |
Integración agricultura ganadería: principales beneficios de la agricultura para la pecuaria. |
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Ano de publicação: |
2007 |
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Fonte/Imprenta: |
In: CONGRESO INTERNACIONAL DE TRANSFERENCIA DE TECNOLOGÍA AGROPECUARIA DEL CONSORCIO DE GANADEROS PARA EXPERIMENTACIÓN AGROPECUARIA, 15., 2007, Asunción, Paraguay. Invernada. Asunción: Consorcio de Ganaderos para Experimentación Agropecuaria, 2007. |
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Páginas: |
p. 101-152. |
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Idioma: |
Espanhol |
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Notas: |
CEA 2007. |
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Conteúdo: |
En este capitulo, son mostrados resultados de diversas UDs, conducidas por la Embrapa, y resultados de pares que adoptaran técnicas de integración agrícola y pecuaria como opcioón recuperación de áreas degradadas. Propiedades estas, que tuvieron incremento de hasta 6500% en la productividad por área comparada con índices de la pecuaria nacional. |
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Palavras-Chave: |
Adoção de tecnologia; Brasil; Integração lavoura-pecuária. |
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Thesagro: |
Cerrado; Pastagem; Plantio Direto; Política Agrícola; Transferência de Tecnologia. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01414naa a2200301 a 4500
001 1216051
005 2008-02-22
008 2007 bl uuuu u00u1 u #d
100 1 $aBARBOSA, V.
245 $aIntegración agricultura ganadería$bprincipales beneficios de la agricultura para la pecuaria.
260 $c2007
300 $ap. 101-152.
500 $aCEA 2007.
520 $aEn este capitulo, son mostrados resultados de diversas UDs, conducidas por la Embrapa, y resultados de pares que adoptaran técnicas de integración agrícola y pecuaria como opcioón recuperación de áreas degradadas. Propiedades estas, que tuvieron incremento de hasta 6500% en la productividad por área comparada con índices de la pecuaria nacional.
650 $aCerrado
650 $aPastagem
650 $aPlantio Direto
650 $aPolítica Agrícola
650 $aTransferência de Tecnologia
653 $aAdoção de tecnologia
653 $aBrasil
653 $aIntegração lavoura-pecuária
700 1 $aKLUTHCOUSKI, J.
700 1 $aMUNIZ, L. C.
700 1 $aMAGNABOSCO, C. de U.
700 1 $aTROVO, J. B. de F.
700 1 $aOLIVEIRA, P. de
773 $tIn: CONGRESO INTERNACIONAL DE TRANSFERENCIA DE TECNOLOGÍA AGROPECUARIA DEL CONSORCIO DE GANADEROS PARA EXPERIMENTACIÓN AGROPECUARIA, 15., 2007, Asunción, Paraguay. Invernada. Asunción: Consorcio de Ganaderos para Experimentación Agropecuaria, 2007.
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Embrapa Arroz e Feijão (CNPAF) |
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